Adding-machine.



H. LANDSIEDEL.

ADDING MACHINE.

APPLICATION FILED FEB. 28, 191e.

Patented May 8, 1917.

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'fl MIMI Nmllllllmlllll UNITED sTATEsI PATENT oEEroE.

HARRY LANDSIEDEL, 0F CINCINNATI, OHIO, ASSIGNOR TO THE DALTON ADDINGMACHINE COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

\ ADDING-MACHINE.

Specication of Letters Patent.

Patented May `8, 1917.

Application :filed February 28, 1916. Serial N o. 80,941.

T all whom it 'may concern.'

Be it known that I, HARRY LANDsIEDEL, a

citizen of the United States, residing at the ing is a specication.

This invention relates to adding machines. The invention relatesspecifically to that class'of adding machines in 'which' the diferentialmechanism comprises a movablel carriage in which are mounted series ofstops settable by operation of the keys to represent the digits of thenumbers to be added or listed by the machine.

The object ofthe present invention is to provide 4a differentialmechanism of the character mentioned, in which the movable stops arearranged in series and are retained in their different positions byspring platesv mounted in the carriage and having arms engaging with'appropriately formed portions on the stops, effectively to retain thestops in their raised or lowered positions,

and adapted to yield to pressure applied to the ends of the stops tomove them to and from their starting points.

In the drawings, Figure 1 is a plan view of a carriage embodying thepresent invention.

Fig. 2 is a view of the carriage inverted.

Fig. 3 is an inner side elevation of the carriage. v

Fig. 4 illustrates the outer side elevation of the carriage.

Fig. 5 is a sectional view which is enlarged with respect to thepreceding views of the drawing.

Fig. 6 is a sectional view on the line 6-6 of Fig. 5.

Fig. 7 is a perspective View illustrating a transverse series of stopsand the coperating spring plate whose arms engage with the stops to holdthem in their different ade justments. i

A machine of the type in which this invention is adapted to be embodiedis disclosed in Hopkins Patent, No. 1,039,130, dated September 24, 1912,and which is commercially known as the Dalton adding machine. Themachine disclosed in the patent and the Dalton adding machine on themarket each includes a differential mechanism comprising a carriageunder control of numeral keys, and. containing pins arranged intransverse series with respect to the machine and in longitudinal serieswith respect to the machine. All the pins of each transverse seriescorrespond to the same digit so that the pins of the several transverseseries represent the several digits. rIhe pins i of the longitudinalseries are arranged in numerical orders and the carriage is moved yinthe well understood manner to position y,the pins in the dili'erentnumerical orders,

as required to control the operations of the adding and listingmechanisms. f

The subject-matterof the present invention is an improvement upon thedifferential mechanism vdisclosed in the Hopkins patent mentioned and isadapted to be embodied in anyL of the machines of the general typedisclosed in that patent, such for instance as the Dalton adding machinewhich is on the market.

As illustrated in the drawings the'carriage includes an upper wall 1 anda lower wall 2, both of which are connected to the side walls-3 of thecarriage. The carriage is supported by rollers 4l which are adapted tooperate upon the usual rails 5.

The differential stop pins 6 are mounted in a longitudinally transverseseries in the carnage and extend through openings in the upper and lowerplates, and are depressible to an extent to place their upperextremities approximately flush, or in the same plane, with theuppersurface of the plate 1. Downward movement of the stop pins is limited bylugs 7 formed on the pins respectively, and adapted to engage with thelower plate 2, as will be understood by reference to Fig. 6. Upwardmovement of the pins is limited by lugs 8 carried by the pinsrespectively, and adapted to engage against the under surface of theplate 1. The pins are normally in depressed position and arel ings 12 inthe upper and lower plates 1 and 2 of the carriage. Each detent memberis formed from a single plate of resilient metal having the detent arms9 integrally connected wlth the transverse part 10 which is pressed sothat it is arcuate in cross section,"

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which is also the form of the supporting parts 11. By this constructionI am enabled to utilize thin metallic plates, the strength andresiliency of which are made appropriate to the duties required of themby pressing the parts 10 and 11, so that they are arcuate in crosssection, thus increasing their strength. There is one of the detent arms9 for each pin of the corresponding transverse series and said arms areformed with angular engaging parts 13 at their lower extremities whichare adapted to engage with the oblique upper and lower edges of theprojections 14 on the corresponding ins. The engaging parts 13 and theprojections 14 are arranged in such proportion to each other and to theextent of movement of the pins, that when the pins are in their lower ordepressed positions the lower sides of the engaging portions 13 engageagainst the oblique upper edges of the projections 14, thus retainingthe pins in their lower positions until they are raised by operation ofthe usual numeral keys. lVhen the pins are raised by operation of thekeys, the detent arms 9 yield to permit the projections 14 to pass theengaging portions 13. The extent of upward movement of the pins is suchthat in their upper positions the oblique lower edges of the projections14 are seated upon the engaging portions 13 of the detent arms, so thatthe same spring device is effective to retain the pins in theirdifferent positions and is also effective to complete the movement ofthe pins whenever the apeXes of the projections 14 pass the points ofthe engaging portions 13.

The differential mechanism constructed and arranged in this manner islight and durable, and does not easily become disarranged or disabled.

The differential carriage described may also be readily combined with orembodied in the machine of the Hopkins patent and the Dalton addinumachine to take the place of the carriage illiistrated in said patentand employed in said machine.

IVhat I claim and desire to secure by Letters Patent is y 1. In anadding machine, differential mechanism comprising transverse series oflongitudinally movable stop pins, a resilient supporting device adjacentto each series of pins, a series of resilient arms carried by saidsupporting device, and projections on said pins engaging said arms.

2. n an adding machine, differential mechanism comprising series oflongitudinally movable stop pins, a resilient support adjacent to eachseries of-pins, resilient arms extending from said support, andprojections on said arms engaging said pins, whereby said arms willretain said pins in their lower position. l

3. In an adding machine, differential mechanism comprising series oflongitudinally movable stop pins, a resilient support adjacent to eachseries of pins, resilient arms extending from said support, andprojections on said arms engaging said pins, whereby said arms willretain said pins in their upper positions.

4. In an adding machine, differential mechanism comprising series oflongitudinally movable stop pins, a resilient support adjacent to eachseries of pins, resilient arms extending from said support, andprojections on said arms engaging said pins, whereby said arms willretain said pins in their lower and upper positions.

5. In an adding machine, differential mechanism comprising a carriagehaving upper and lower wall plates, series of vertically movable stoppins carried by said plates, means for limiting upward and downwardmovement of said pins, a resilient support adjacent to each series ofpins, and resilient arms on said support engaging and retaining saidpins in their lower positions.

6. In an adding machine differential mechanism comprising upper andlower supporting plates, series of vertically movable stop pins carriedby said plates, parts on said pins limiting upward and downward movementthereof by contact with said plates, a support adjacent to each seriesof '.pins, resilient arms carried by said support,

and engaging portions on said arms arranged to engage and retain saidpins in their upper positions.

7. In an adding machine, differential mechanism comprising upper andlower plates, series of vertically movable stop pins carried by saidplates, projections on said pins for limiting movement thereof throughsaid plates, aI transverse resilient support adjacent to each series ofpins, resilient parts engaging said plates and retaining said support inposition, and resilient arms in said transverse support arranged toengage said pins to hold them in their upper and lower positions.

' 8. In an adding machine, differential mechanism comprising upper andlower plates, series of stop pins carried by and movable verticallythrough said plates, projections on said pins for limiting movementthereof through said plates, detent devices vengaging said pins to holdthem in their different positions, and resilient supports for saiddetent devices.

9. In an adding machine, differential mechanism comprising supportingplates, longitudinally movablepins carried by and movable through saidplates, means for limiting movement of said pins relative to saidplates, resilient detent arms engaging said pins, resilient supports forsaid arms, and

means whereby said arms will complete the final movements of said pinsin both direc-y tions.

l0. In an adding machine, differential mechanism comprising upper andlower plates, a series of pins carried by and movable vertically throughsaid plates, a pointed projection on each of said pins, detent devicesengaging said pointed projections, and

ladapted to coperate therewith to complete the movement of said pins inopposite directions and to retain said pins in their diiferentadjustments, and a resilient support for all of said detent devices.

1l. In an adding machine, differential mechanism comprising upper andlower plates, series of vertically movable stop pins carried by andmovable through said plates,

projections on said pins for limiting movement thereof through saidplates, resilient supports adjacent to each series of pins, means inconnection with said support engaging said plates to hold said supportsin proper position, pointed projections on said pins, and resilient armson said resilient supports arranged to engage said pointed projectionsto hold said pins in their upper and lower positions. 1

In witness whereof, I have signed this specification in the presence oftwo subscribing witnesses.

HARRY LANDSIEDEL. Witnesses:

R. D. BRYAN, B. C. HARRIsoN.

